643348 has 12 divisors (see below), whose sum is σ = 1192212. Its totient is φ = 302720.

The previous prime is 643303. The next prime is 643369. The reversal of 643348 is 843346.

It can be written as a sum of positive squares in 2 ways, for example, as 492804 + 150544 = 702^2 + 388^2 .

It is a congruent number.

It is an unprimeable number.

643348 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4663 + ... + 4798.

It is an arithmetic number, because the mean of its divisors is an integer number (99351).

2⁶⁴³³⁴⁸ is an apocalyptic number.

643348 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

643348 is a deficient number, since it is larger than the sum of its proper divisors (548864).

643348 is a wasteful number, since it uses less digits than its factorization.

643348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9482 (or 9480 counting only the distinct ones).

The product of its digits is 6912, while the sum is 28.

The square root of 643348 is about 802.0897705369. The cubic root of 643348 is about 86.3273981433.

The spelling of 643348 in words is "six hundred forty-three thousand, three hundred forty-eight".